[Feature Request] Watch mode for type generation #925

Description

A long-running command that continuously re-generates the typings for the env schema upon change.

Motivation

I am developing a CLI app, which does not have "dev server", instead I run tsc --watch, which helps me debug stuff live (apart from the LSP).

When I edit the .env.schema, these changes are not reflected though, when running

varlock run -- tsc --watch

Proposed Solution

varlock run --watch or varlock codegen --watch

Alternatives

Re-running the "dev" command every time .env.schema has changed.

Additional Information

No response